High-pressure gate-valve.



S. S.. CASKEY. A HIGH PRESSURE GATE VALVE. APPLIGATION FILED AUG. 2a,1909.

Patented m1731913.

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. ,SAYIMIII'EL S. CASKEY, 0F PHILADELPHIA, PENI'SYLVANIA, ASSIGNOB T0CASKEY i VALVE COMPANY, OF PHILADELrHIA, PENNSYLVANIA, .A CORPORATION' ONEW YORK.

Specification of vLetters Patent.

' Application leyugust 234,4 1909. Serial No. 514,188`

HIGH-PRESSURE GATE-VALVE.

Patented Jal-1.7, 191s.

To all whom, t may concem:

Be it known that I, SAMUEL S. CASKEY, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented a new and useful High-Pressure Grate-Valve, of which thefollowing is a specification.

rlhis invention relates to valve structures and more particularly to thetype known as gate valves for use in connection with all types of highfluid pressures such as steam,

air or water, and has for an object to prevent various conduits, theparts especially in gate.

valves, are subjected to a large amount of Wear and if not constantlyexamined, become less eiicient and often inoperative through thepressureleaking to the atmosphere.

ln my present invention I have devised a novel means of packing, a gatevalve in cooperation with which l employ a 'sealing bushing including anovel packing device whereby escaping pressure from the valve conduitoperates in conjunction with the packing means to increase the eciencythereof and reduce the danger of leakage to a minimum.

It further consists of other-novel features of construction, all as willbe hereinafter fully set forth.

For the purpose of illustrating my inventin, I have shown intheaccompanying drawings one form thereof which is at presentpreferred-.by me, since the same has been found in practice to'givesatisfactory and reliable results,'althongh it is to be understood thatthe various instrumentalities of which my invention consists can bevariously arranged and organized and that my invention is not limited tothe precise arrangement and organization of these instrumentalities asherein showr and described.

Figure l represents a side elevation of a valve embodying my invention.Fig. 2 represents a section on linea-fa', Fig.' 1;

Similar numerals of' reference indicate corresponding parts in thefigures.

- Referring-to the' drawings: 1- designates the casing of a valveembodying my invention, the same being provided with a longitudinal bore2 therethrough for the purpose., of establishing communication from oneside of the valve to the other asis well known, in the art, to whichthis invention applies.

3 designates a gate suitablymounted for sliding movement within thecasing 1 it being understood that a portion of the casing 1s aperturedto permit the said gate to pass transverse of the bore 2 and thereby atcertain intervals cle-se the same and prevent passage of fluidtherethrough. For the purpose of operating the gate 3 in the presentinstance, I employ a rod4 suitably threaded 1n an enlarged portion 5 ofthe gate 3, whereupo-n itwill be clear that by rotating the said rod 4,the gate 3 Will be moved in one direction or the other, as desired.

6 designates the usual stuffing box structure serving to prevent leakagearound the stem of the rod 4 and it is not thought neoessary to go intothe details of construction of the saine.

Y '7 designatesan opening through the gate 3 which is .suitably locatedso as to aline with the bore 2 at certain times and thus permit a flowof Huid through the valve.

8 designates a packingsuitably disposed adjacent the gate 3 andencircling the bore 2, whereby escape of pressure Huid is prevented onone side of the gate 3.

' 9 designates a sealing bushing slidingly mounted in the bore 2, in thepresent instance on the opposite side of the gate 3 from the packingSand normally abutting the face of the gate 3, the face of said bushjing'being preferably ground to form a tight 'joint with said gate.- Asuitable bore 10 is provided in the bushing in order to correspond tothe bore 2 of the casing l.

ll designates a retainin' screwed or otherwise secure within the :casingl at a suitable point with res ect to the bushing -9 and the 'same isprovi ed with a bore 12 for the obvious.purpose of permitting uvid topass through the bore 2. The sealing bushing, it will be noted, ismounted inthe casing of the valve at the intake end, whereby? thepressure fluid entering the casingwill force the said bushing atall-times against the gate 3, so that the pressure itself vin the valvetends to form a tight joint between these parts, the advantages of whlchare evident. lIn some instances A`I may, 1f

plug which is.

desired, employ a spring 13 situated between the sealing bushing 9 andthe plug l1 in order to form a yielding pressure to assist in holdingthe said plug tightly against said gate 3.

.14 designates a packing suitably mounted and encircling the bushing 9with which packing a plurality of ports 15 are adapt-A ed to communicatevin ord'erv to transmit fluid pressure back of the packing and furtherextend the same to make a pressure to the surface exposed to the actionof the fluid pressure, that the parts readily become worn and permitescape of -fluid very readily and it will be apparent that in the typeof valve which I have devised, all portions subjected to pressure areefficiently packed and furthermore any 'leakage which may escape is usedto vmaintain all packings absolutely tight over their respective jointsand it is practically impossible for any of the said pressure fluid toreach the eX- terior of the casing.

It will'now be apparent that'Ivhave devised anovel and usefulconstruction which embodies the features of advantage enumerated asVdesirable in the statement of' the invention and the above description,and while I have in the present instance shown and described thepreferred embodiment -thereof which has been found in practice to givesatisfactory yand reliable results, it is to be understood that the sameis susceptible of modification in various particulars without departingfrom the spirit or scope of the invention or sacrificing' any of itsadvantages.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. In a` device of the character stated, a casing having a boretherethrough, a gate in said casing adapted to open and close said bore,a stationary packing upon one side of said gate and betweenvthesal'neand a wall of said casing and upon Vthe oppositeside of the valve fromthe fluid ressure entrance, a sealing bushing abuttlng 'said gate andforced thereagainst` by the fluid pressure in the valve, packing betweensaid bushing and casing, and means in the wall of sa'id casing upon theopposite side of the valve from the fluid pressure entrance leading fromthe interior of the casing to asuitable point with respect to saidstationary packing for directing the Huid pressure leaking between thegate and the bushing back of said stationary packing tol force the sameagainst said gate.

2. In a device of the character described,

4a casing having a bore therethrough, a gate in said casing adapted toopen and close said bore, a stationary packing encircling the casingbore upon one side of the gate .and 7between the same and a wall of saidcasing, a sealing bushing abutting said gate and forced thereagainst bythe fluid pressure in the valve, al packing encircling said bushing, andmeans to' admit fluid pressure back of said packing to compress' thesame over a joint, and said casing having means leading from theinterior thereof for directing the pressure iuid, leaking between thegate and the bushing, back of said tionary packing to force the sameagainst vsaid gate.

3. In a device of the character described, a casing having a boretherethrough, a gate in said casing adapted to open and close said bore,la stationary packing upon one side of said gate between the same and awlall of .the casing and upon the opposite side of the gate from thefluid pressure entrance, a sealing bushing abutting said gate and forcedthereagainst by the fluid pressure' in the valve, said casing havingmeans leading from the interior thereof for di.

recting the pressure fluid, leaking between the gate andthe bushing,back of said staf tionary packing to fonee the same against said gate,and means for raising and lowering said gate.

'- l v SAMUEL S. CASKEY.

Witnesses: j V

JOSEPH I-I. Balm',l y ISAAC R. WITMSER.

